build new image

docker-ubuntu-latest/Dockerfile

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+FROM ubuntu:22.04
+
+LABEL maintainer="homelab"
+LABEL description="ubuntu-latest runner image — Node 20 + Docker CLI + git"
+
+ENV DEBIAN_FRONTEND=noninteractive
+ENV NODE_VERSION=20
+
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    curl \
+    wget \
+    git \
+    ca-certificates \
+    gnupg \
+    unzip \
+    jq \
+    openssh-client \
+    && rm -rf /var/lib/apt/lists/*
+
+# Node.js 20 LTS
+RUN curl -fsSL https://deb.nodesource.com/setup_${NODE_VERSION}.x | bash - \
+    && apt-get install -y --no-install-recommends nodejs \
+    && rm -rf /var/lib/apt/lists/*
+
+# Docker CLI only (no daemon)
+RUN curl -fsSL https://download.docker.com/linux/ubuntu/gpg \
+      -o /etc/apt/keyrings/docker.asc \
+    && chmod a+r /etc/apt/keyrings/docker.asc \
+    && echo "deb [arch=$(dpkg --print-architecture) \
+      signed-by=/etc/apt/keyrings/docker.asc] \
+      https://download.docker.com/linux/ubuntu \
+      $(. /etc/os-release && echo "$VERSION_CODENAME") stable" \
+      > /etc/apt/sources.list.d/docker.list \
+    && apt-get update \
+    && apt-get install -y --no-install-recommends docker-ce-cli \
+    && rm -rf /var/lib/apt/lists/*
+
+# Smoke tests
+RUN node --version && docker --version && git --version